长江中游干流悬沙垂线分布研究

Vertical distribution of suspended sediment in middle reaches of Yangtze River

为探明长江中游河段悬沙垂向分布规律,在总结分析相关研究成果的基础上,进一步用实测资料对Rouse公式、张小峰公式、E M Laursen公式、莱恩-卡林斯基公式进行了对比研究及合理性分析,选择适用于长江中游各段悬沙垂向分布计算的合理公式。结果表明:当泥沙颗粒较细且含沙量较小(S<0.1 kg/m^3)时,Rouse公式、张小峰公式、E M Laursen公式、莱恩-卡林斯基公式的计算结果与实测资料都比较吻合;在含沙量较小、紊动较大的中泓处,张小峰公式和E M Laursen公式的计算精度高;在长江中游河段近两岸处,莱恩-卡林斯基公式的计算精度较高。

To explore the vertical distribution law of suspended sediment in middle reaches of Yangtze River, on the basis of the research result summarization of sediment vertical distribution, the Rouse formula, Zhang Xiaofeng formula, Laursen EM for- mula, Lane E W＆ Kalinske A A formula are studied comparatively and the rationalities are analyzed by using the measured data. The rational formula is selected to calculate the vertical distribution of suspended sediment of middle reaches of Yangtze River. The results show that in the case of fine sediment particles and small sediment concentration （ smaller than 0.1 kg/m3 ） , the re- suits of Rouse formula, Zhang Xiaofeng formula, Laursen EM formula, Lane E W＆Kalinske A A formula are well in line with the measured data; Zhang Xiaofeng formula and Laursen EM formula can obtain higher accuracy in calculating the sediment distribu- tion at thalweg where the concentration is small and the turbulence is strong; Lane E W＆Kalinske A A formula can better calcu- late the sediment concentration near both banks at middle reaches of Yangtze River.